Verrill, Notes on Radiata. 319 



ing to the Boston Society of Natural History and the Essex Institute, 

 received from the Museum of Comparative Zoology. Whether it be 

 really distinct can be ascertained only by an actual comparison of 

 authentic specimens of each, the descriptions of J/, stinialis not being 

 sufficient to distinguish it from JI. Garretii. 



Metalia nobilis Verriii, sp. nov. 



Test depressed above, most elevated at the abactinal pole and upper 

 part of posterior interambulacrum ; anterior end arched ; posterior 

 end obliquely truncated ; lower surface but little convex. In a view 

 from above the form is very broad oval, the anterior end a little emargi 

 nate, the posterior truncate, but prominent. 



Extreme length 4*5 inches ; breadth 4 ; height 2-2 ; from abactinal 

 pole to anterior end 2 ; to posterior end 3'1 ; to end of anterior am- 

 bulacral rays 1*7 ; to end of posterior 1-92 ; to peripetalous fascicle 

 in posterior interambulacrum 1-5; in lateral interambulacra 1'3 ; in 

 anterior ambulacrum 1-7 ; length of anal area "62 ; breadth "52 ; length 

 of subanal fasciole "88 ; breadth 1 '35 ; from anal area to fasciole "25 ; 

 mouth to subanal fasciole 2-45; breadth of plastron 1"25; length 

 of spines of lower surface -5 5 ; of ujiper surface bordering ambula" 

 era -22. 



The anterior ambulacrum is but slightly sunken ; the lateral ones 

 in deep grooves, nearly uniform in width ; the anterior pair nearly 

 straight ; the posterior curving slightly outward. The lateral and 

 posterior interambulacra are convex within the peripetalous fasciole, 

 but beyond this the latter is suddenly depressed, causing a slightly 

 concave place, behind which it is slightly convex, and slopes gradu- 

 ally to the posterior end. The peripetalous fasciole is nearly trans- 

 verse in front, bending upward for a short distance, nearly at a right 

 angle, about at the middle of the anterior-lateral interambulacra, and 

 then turning back again at a similar angle, ])asses close by the end of 

 the ambulacral rays. In the lateral and posterior interambulacra it 

 bends but slightly upward, and does not margin the ambulacra. The 

 sub-anal fasciole is rather large, broader than long, broad heart- 

 shaped, the lower end terminating in a slight point, the lower sides 

 rounded to the extreme lateral lobes ; the upper or posterior side 

 with a straight line in tlie middle, and slightly concave ones running 

 to the lateral lobes. From each end of the straight, posterior part a 

 narrow fasciole passes outward and upward in a broad cui-ve and 

 terminates about opposite the middle of the anal area. The anal 

 area is broad-oval, longer than broad. The plastron is elliptical, but 

 little convex, the most prominent points being at the posterior 



Trans. Conxecticut Acad., Vol. I. 41 June, 1867. 



